In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
-----How much will I pay for a night? ------Prices___________from room to room.
When I got back home I saw a message pinned to the door, ______ “Sorry to miss you; will call later.”
----Have you seen____pen﹖I left it here this morning. -----Is it____black one﹖I think I saw it somewhere.
The news has spread all over the country ____ the spaceship succeeded in returning to the earth.
____ he works hard, I don’t mind when he finishes the experiment.